Centrifugal pttmp



A. W. WELLINGTON AND- A. F. RYAN.

CENTRIFUGAL PUMP.

APPLICATION FILED NOV. 1. 1920.

1,386,293 Patented Aug. 2, 1921.

FIGURE 4 |NVENTOR5 FIGURE 1 ATTORNEY UNITED STATES Parent @FHQF...

ARTHUR W. WELLINGTON AN ARTHUR F- RYAN, OF SAN JOSE, CALIFORNIA.

CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented Aug. 2, 1921.

Application filed. November 1, 1920. Serial No. 421,088.

To all whom it may concern:

Be it known that we, ARTHUR 7V. WEL- LrNGToN and ARTHUR F. RYAN, citizens of the United States, and residents of San Jose, in the county of Santa Clara and State of California, have invented certain new and useful Improvements in Centrifugal Pumps, of which the following is a specification.

Our invention relates particularly to the operating mechanism of a deep well centrifugal pump. It is the object of our invention to provide an operating mechanism of the character indicated in which the usual bearings for the driving shaft areentirely eliminated between the pump and the pump bowl, thereby materially simplifying the construction and reducing the cost of producing and installing the type of pump referred, as well as materially reducing the cost of operation and upkeep of the pump.

In the drawing:

' Figure 1 is a vertical section through a deep well equipped with a pump embodying our invention.

Fig. 2 is an enlarged detail section through a form of pump head that may be used in a pump embodying our invention.

Fig. 3 is an enlarged detail section through a form of pump bowl that may be used in a pump embodying our invention.

Fig. 4 is a plan view of the structure shown in Fig. 2.

Fig. 5 is an enlarged detail section through a type of shaft coupling adapted for use in our invention.

Referring more particularly to the drawings, 1 indicates a well in which a pump bowl 2 is suspended by means of discharge casing column 3 provided with a discharge opening at 4 and a'pump head at 5. In the present instance the pump head 5 is shown as threaded at 6 to receive a bearing 7 for pump shaft 8, the bearing 7 having a raceway 9 formed therein for ball bearing 10, and the shaft 8 having a collar 11 secured thereto and provided with a raceway 12 to engage ball bearing 10. On bearlng 7 is formed a flange 13 having an hexagonal outer surface as 1 1 to permit the application of an instrument thereto for turning bearing 7 in head 5. Flange 13 also forms a basin 15 for a quantity of oil for lubricating the bearings.

Bowl 2 is of the well known type having a bearing supported therein as at 16, the

shaft 8 carrying the usual impeller 17. In

the present case the bearing 16 is provided with a raceway 18 to receive ball bearings 19, and lmpeller 17 is provided with a raceway 20 to receive said ball bearings 19. The shaft 8 is built up of the necessary number of lengths of shaft sections joined by conplings 21 and is unsupported in any way between the top bearing 7 and the bearing 16 in the pump bowl.

When a pump of this type is in operation I is used instead of the ordinary steel shaft-' ing of comparatively large diameter. In other words, the less the cross-sectional area of the shaft used the less the vibration or swaying of the shaft. The shaft must, of course, have the necessary strength to remain intact under the high torsional strain to which it is subjected. We have found, in practice, that a high grade chrome steel alloy shaft of small diameter gives excellent results. We have also found that a shaft of this character is somewhat flexible and a shaft having some flexibility is more easily rendered vibrationless by the direct water pressure and tensional strains thereon than a shaft of more rigid construction. In fact a perfectly flexible shaft would be preferable to a more or less rigid one because a swaying movement set up in any portion thereof is more local in its nature and is more rapidly overcome by the tensional strain on the shaft, but a perfectly flexible shaft, such as a cable, is materially shortened in length by the twisting thereof and there fore a shaft of the character indicated is deemed preferable. While a cold rolled steel shaft of the usual type is not desirable in the present invention for comparatively shallow wells, itsfitness increases proportionately as the depth of the well, it being obvious that a long steel shaft is more flexible than a short one.

The tensioning of shaft 8 may be increased by inserting roller bearings in the head as at 10 and bearings in the bowl as at 19, and providing a means for tightening the shaft between the two bearings as by the I adjustment of threaded 'member 7. It is apparent that where bearings as shown at 10 and 19 are used the discharge casing column 3 acts as a compression member, but the bearing 19 may not always be required in which case casing 3 functions only in its customary manner.

The water pressure in discharge casing column 3 may be further utilized by forming the couplings 21 as shown in Fig. 5 with a cone shaped surface 22. Since the water moves more or less rapidly upward past the coupling, the latter at the same time being rapidly revolved, an angular upward thrust against the coupling is effected which tends to steady the shaft and hold it in its vertical position.

It is clear, of course, that many modifications of the invention herein disclosed may be made, the present disclosure being illusdischarge casing column, an impeller arranged in said bowl,'and a flexible driving shaft operatively mounted with relation to said head" and said impeller and unsupported against a swinging movement with respect to its normal vertical axis between said head andbowl.

2. A pump mechanism comprising a pump head, a discharge casing column suspended therebelow, a pump bowl supported by said discharge casing column, an impeller arranged in said bowl, a driving shaft operatively mounted with relation to said head and said impeller, and unsupported against a swinging movement with respect to its normal vertical axis between said head and bowl, and means for tensioning said shaft between said head and bowl.

3. A pump mechanism comprisingapump head, a discharge'casing column suspended therebelow, a pump bowl supported by said discharge casing column, an impeller arranged insaid bowl, a driving shaft operatively mounted with relation to said head and said impeller, and unsupported by bear ings between said head and bowl, and means mounted on said shaft to coiiperate with the moving water inv said casing column for steading the movement of said shaft when revolving.

ARTHUR W. dVELlJINGTON. ARTHUR F. RYAN. 

